Automobile jack



Jan. 2, 1934. M. DWORK 1,941,854

AUTOMOBILE'JACK Filed June 4, 1931 2 Sheets-Sheet l INVENTOR WITNESS MaxDurorK MM? #3 .2 BY j v mafia.

ATTORNEY Jan. 2, 1934- M. DWORK AUTOMOBILE JACK Filed June 4, 1931 2Sheets-Sheet 2 5M v a R r w 51 .U 0 0 R a 4 7a; 3 m

m MD A A. l X 11 a Mm g :5 w j 4 my 8 5/ m m w N 4 A 7 6 a J; W fl 2 6M, x 7 8 a A Q L IN yuan! H\ .|dl Win 5 II T f/ AWK k n 6 SIM I l 1 LiJ5m N n H W YUM W m K 0 and21 of the standard 10.

through the front wall of the standard 10 and the web portion of saidpost.

' When the standard 17 is in the lowermost or depressed position thespring pressed bar. 24 will seat within a notch 36 in the edges of theflanges 23 whereby to lock the'post 17 against outward movement. Acontractile spring 37 secured at one end of the lower end of the post 17and at its other end. to the bar 24 automatically raises the post 17 outof the standard 10' when the bar 24 is released or is retracted fromengagement with the notch 36.

The upper end'of the post 1'7 is bifurcated-and; has a shaft 38extendingbetween the furcations' 39 thereof. The shaft 38 has a spool or roller40 journalled thereon over which a flexible strap 41 is trained. Thestrap 41 carries'a pair of co operating grapplng hook's42'at' one endthereof and has the other end secured to-a rotatable shaft 43 whch isjournalled in the side walls 20 The shaft 43'extends through the sidewall 21 and has a toothed wheel '44 keyed thereon. A bell crank'lever 45is journalled on the outer end of the shaft 43 adjacent the wheel 44 andhas a pivoted spring pressed operating pawl '46 carried'by one arm 47thereof for engagement in one direction of movement 'with the" wheel 44.The-other arm 48 of the bell crank engages within a socket in the end.of an operating handle'49 and is lockedtherein during rotation of thejack by means cf a thumb screw 50. It will be seen from an inspection ofFig.1 that movement of the outer end of the operating lever upand downwill result in rotation of the wheel 44 and thus the shaft 43' causingthe flexible strap-41 to be wound upon said" shaft. Reverse rotationofthe wheel 44 and shaft 43 during upward movement of the lever 49 isprevented by means of a back-check pawl 51 formed with one end of an arm52 which is pivoted intermediate of its ends to the side wall 21 belowthe wheel 4421s at 53. A'contractile spring 54 extends between'theopposite end 55 of the arm 52 and a point 56 on the standard 10 andservesto maintainthe-pawl 51 in engagement with the wheel445 The pawl 46carries a pivoted latching lever 57,

the free end of which may be engaged in a notch58 in the hub of the bellcrank 45 in an obstructing position to raise the pawl "46 out ofengagement with the wheel 44. The pawl 51 may be disengaged from thewheel 44 through the medium of a'chain 59 extending between the end 55"of the arm 52 and astrap 60 embracing the lever 49,*the end of thechain 59 being detach- }ably'secured'to' a ring 61 carried by the strap-60"through the mediumof a snaphook 62 By latching the pawl 46 oiit ofengagement withthe wheel 44 and then raising the lever 49 to thepositionshown in'Fig". 4, bothfpawlsf4fi and 51 will be-disengaged fromthe wheel 44jand the strap 41 will be permitted torotatefin a directionto-unwind the strap 41. r I u 7 t V In'the operation of the jack. thepost '17 V is first raised to extended position andthehooks 42 areengaged with theend of the chassis 639f an tautomobileor other vehicle.With thepawl 46' engaged with the wheel'44 the lever 49 is operated toeffect: rotation of the shaft 43 in a counter-clockwise direction to'wind'the'strap 41 thereon and elevate thecar. pivoted door 64 may beprovided in the rear. wall 32 of the standard '10 to accommodate theincreased bulk as the strap 41 is wound up; When his desired the spring.Y

end of the chassis is raised by winding thel'strap by the appendedclaims.

to lower the car, the pawl 46 is locked out of engagement with the wheel44, the chain 59 is hooked on to the ring 61 of the strap 60 and thethereby permitting the weight of the car suspended from the hooks 44 tounwind the strap 41 from the shaft 43. In order to prevent too sudden alowering .of the car, a suitable friction brake 65 may be provided onthe shaft 43 and the pawl 51 may also be allowed to intermittentlyengage the wheel 44601311217 a possible injury to the car due toa suddenfall will be obviated.

.In the modified form of the invention shown in Figs. 8 and 9 the post17 carries a pair of forwardly extending horizontal arms 66, the innerends of which are journalled on the shaft 38 on either side of theroller 40. A shaft 6'7 extendsbetween the outer ends of the arms 66 andhas a roller 68 journalled thereon over which the strap 41 is trainedafterits passage over the roller 40. The bifurcated brace arm 69 extendsbetween the shaft 67 and the post17, the lower end of said brace beingformed to hook over the upperl edge 70 of the web portion of said postbetween" the furcations 39. The purpose of the extending arms 66 is toadapt the 'jack for use with vehicles-having bumpers which projectbeyond therear end of the frame of the car. In order I bracket 72 isprovided with a pair of spaced plates '73 and 74 between which the lowerflange. 75' of the channel frame 63 is received. A set screw .76 passingthrough the plate '73 serves to lock the bracket to the frame. A pair ofdepending side, plates 77 and 78 formed'with the plates '73 and 74 havepins 79 extending betweeneach end thereof to which the ends of thestrap'80 are secured as at 81. A suitable rubber buffer 82 is carried bythe under side of the bracket 72.. for engagement with the upper side ofthe axle when the spring is abnormally compressed.

Injcase the strap cannot be'u'sed with certain types of cars, I haveprovided another type of sag limiting. means comprising an angle,

bracket having an upstanding .flange 83 for engagement against the web84 of the chassis frame 63 and having a bolt .85 (Fig. 10) extending atright angles to thefiange 83 and projecting through openings inthe'plates '77 and"'78 ofthe braoket'72 being securely fastened theretoby means of a nut 86 received on the threaded (Fig. '7). The ends of,the cable are fastenedftogether to form a' loop which limits the sag'of It will thusfbe seen thatwhen lthe 41 onto the" shaft ra n will notbe necessaryto f raise the chassis to an undue height before the wheelleaves the ground as will be the case if 'a sag limiting means .were notprovided. a 7

Although a preferredembodiment of thefin vention has been shown anddescribed, it: will be understood that variouschanges in the det'ails ofconstruction may be made without departing from the spiritof theinventionas defined bar is movably carried by the standard, andresilient means for moving the mounting means toward the post to engagethe bar either with the seat or the notch depending on the relation ofthe post with respect to the standard.

2. In a jack, a post having an opening, a stand- I ard with which thepost has telescopic engagement, said standard having a slot, a barhaving a portion occupying the slot, mounting means movably attached tothe standard and carrying the bar for movement in the slot toward andaway from the post, and resilient means acting on the mounting means andkeeping the bar against the post and in said opening;

3. In a jack, a post having an opening, a standard with which the posthas telescopic engagement, said standard having a slot, a bar having aportion occupying the slot, mounting means movably attached to thestandard and carrying the bar for movement in the slot'toward and awayfrom the post, resilient means acting on the mounting means and keepingthe bar against the post and in said opening, a bail attached to saidmounting means, and a lever connected with the bail and contacting thestandard, the operation of the lever moving the mounting means co'ntraryto said resilient means thereby to move the bar away from the post;

4. In a jack, a post having a side notch, a

standard into which the post is telescoped until' the notch enters theconfines of the standard, a bar and mounting means by which the bar ismovably carried by the standard, said bar occupying the notch to holdthe post in thetelescoped position, and a spring having its respectiveends connected with the bar and with the bottom of the post, said springbeing under tension while the post is telescoped thereby serving toraise the post out of the standard when the bar is disengaged from thenotch.

5. In a jack, a rotatable winding shaft and a toothed wheel affixed tothe shaft, an operating lever having a notch, an operating pawl carriedby the lever to operate the toothed wheel, and

3 latch means carried by the operating pawl for holding said pawl indisengagement from the toothed wheel, said latch means comprising alever to engage the notch.

6. In a jack having a rotatable winding shaft and a toothed wheelaffixed to the shaft, an operating lever and a pawl carried thereby tooperate the toothed wheel, a back check pawl riding the wheel tonormally prevent retrograde rotation;

latch means carried by the operating pawl and.

being movable into an obstructing position against the lever for holdingthe operating pawl in disengagement from the toothed wheel, and meansoperated by the lever upon upward shifting thereof beyond its normalrange of operating movement to displace the back check pawl and free thewinding shaft, said means comprising a flexible element having itsrespective ends connected with the lever and with the back check pawlbeing drawn taut in the abnormal upward movement of the lever.

'7. In a jack, a lever having an arm and a notch, a pawl and means bywhich it is pivotally mounted on the substantial extremity of the arm,resilient means pressing on the pawl andtenoling to keep it inengagement with a ratchet wheel intended to be turned, and a latchinglever pivotally carried by the pawl, being engageable with the notch tohold the pawl in an inoperative position against the tension of saidresilient means.

8. In a jack, a hollow standard having an opening in one of itssidewalls, a winding shaft mounted'in the standard adjacent to saidopennig, a flexible element connected with the shaft to be woundthereon, and a door'p'ivoted to the stand ard for thenormal closure ofsaid opening, said door swinging to an open position to accommodate. theincreasing bulk when said flexible element is wound on the shaft.

9. A jack having an extensible post with a seat, a standard with respectto which the post is extensible, a bar to enter the seat, and hold thepost extended, and mounting means by which the bar is movably carried bythe standard; means to retract the bar. and release the post said meanscomprising a member carried by the bar, and a lever carried by saidmember, having one end bearing against the standard.

MAX DWORK. V

